膨润土-壳聚糖复合材料对罗丹明吸附行为的研究
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摘要
以膨润土-壳聚糖复合材料为吸附剂,对模拟罗丹明B废水进行吸附行为研究,考察了壳聚糖负载量、pH值、吸附时间、罗丹明B初始浓度等因素对吸附效果的影响,并分析吸附等温线及吸附机理。结果表明,最佳壳聚糖负载量为0.005g/g,最佳pH值为6;随着吸附温度的升高,吸附量增加;在吸附过程中化学吸附占优势;对实验数据运用相关吸附等温线模型拟合,得出等温吸附平衡更符合Langmuir模型。
In this paper,bentonite-chitosan composites were adopted as adsorbent to study the adsorption of Rh B from the simulated Rh B-contained solutions.The effects of chitosan loading amount,p H,adsorption time,and initial concentration of Rh B solution on the adsorption were studied in details and the adsorption isotherm and adsorption mechanism were analyzed as well.The results showed that the optimal chitosan loading amount was 0.005 g/g and the optimal pH was 6.The adsorption amount increased with the increase of adsorption temperature.During the adsorption process,chemical adsorption occupied the dominant position.The experimental data indicated that Langmuir model could describe the process properly.
In this paper,bentonite-chitosan composites were adopted as adsorbent to study the adsorption of Rh B from the simulated Rh B-contained solutions.The effects of chitosan loading amount,p H,adsorption time,and initial concentration of Rh B solution on the adsorption were studied in details and the adsorption isotherm and adsorption mechanism were analyzed as well.The results showed that the optimal chitosan loading amount was 0.005 g/g and the optimal pH was 6.The adsorption amount increased with the increase of adsorption temperature.During the adsorption process,chemical adsorption occupied the dominant position.The experimental data indicated that Langmuir model could describe the process properly.
引文
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[13]Yang J L,Zhou J B.Adsorption of nicotine from aqueous solution by activated carbons prepared from Chinese Fir sawdust[J].Acta PhysicoChimica Sinica,2013,29(2):377-384.
[2]Yoon J W,Baek M H,Hong J S,et al.Photocatalytic degradation of azo dye using Ti O supported on spherical activated carbon[J].Korean J 2Chem Eng,2012,29(12):1722-1729.
[3]翟佳赢,李建熹,徐景阳,等.膨润土负载壳聚糖吸附剂处理染料废水的实验研究[J].环境保护科学,2009,35(4):70-71,101.
[4]Ahmed M J.Application of agricultural based activated carbons by microwave and conventional activations for basic dye adsorption:Review[J].Journal of Environmental Chemical Engineering,2016,4(1):89-99.
[5]Brillas E,Martínez-Huitle C A.Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods:An updated review[J].Applied Catalysis B:Environmental,2015,166-167:603-643.
[6]Yao T,Guo S,Zeng C,et al.Investigation on efficient adsorption of cationic dyes on porous magnetic polyacrylamide microspheres[J].Journal of Hazardous Materials,2015,292:90-97.
[7]Gheju M,Balcu I,Mosoarca G.Removal of Cr(VI)from aqueous solutions by adsorption on Mn O[J].Journal of Hazardous Materials,22016,310:270-277.
[8]Dotto G L,Rodrigues F K,Tanabe E H,et al.Development of chitosan/bentonite hybrid composite to remove hazardous anionic and cationic dyes from colored effluents[J].Journal of Environmental Chemical Engineering,2016,4(3):3230-3239.
[9]Zhang H L,Liang X Y,Yang C,et al.Nanoγ-Fe O/bentonite 2 3magnetic composites:Synthesis,characterization and application as adsorbents[J].Journal of Alloys and Compounds,2016,688(Part A):1019-1027.
[10]张春,任建敏,王媛媛,等.壳聚糖改性膨润土对罗丹明吸附特性研究[J].广州化工,2009,37(3):122-124.
[11]邵红,程慧,李佳琳.负载壳聚糖膨润土的制备及其吸附性能的影响[J].坏境工程学报,2009,4(5):1597-1601.
[12]陆晶,黄丽,邵春雷,等.高铁酸钾氧化降解罗丹明(Rh B)水溶液的研究[J].环境化学,2007,26(3):367-370.
[13]Yang J L,Zhou J B.Adsorption of nicotine from aqueous solution by activated carbons prepared from Chinese Fir sawdust[J].Acta PhysicoChimica Sinica,2013,29(2):377-384.